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Volcanic Landforms

Volcanic Landforms. 6 th Grade. 2 Kinds of Volcanic Eruptions. Quiet Eruptions: If magma is low in silica Lava is low in viscosity and flows easily Explosive Eruptions: If magma is high in silica Lava is high in viscosity and flows slowly

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Volcanic Landforms

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  1. Volcanic Landforms 6th Grade

  2. 2 Kinds of Volcanic Eruptions • Quiet Eruptions: • If magma is low in silica • Lava is low in viscosity and flows easily • Explosive Eruptions: • If magma is high in silica • Lava is high in viscosity and flows slowly • Explosive eruptions breaks lava into fragments that quickly cool and harden into pieces of different sizes like ash, cinders, bombs in a pyroclastic flow

  3. Pyroclastic Flow: when an explosive eruption hurls out a mixture of hot gases, ash, cinders, and bombs • Ash: fine, rocky particles as small as a speck of dust • Cinders: pebble-sized particles • Bombs: large particles that range from the size of a baseball to the size of a car

  4. Volcanic Ash Cloud • http://www.youtube.com/watch?v=Jav4-GLXecQ

  5. Volcanic Eruptions create landforms made of lava, ash, and other materials. 4 Types of Landforms: 1) Shield Volcanoes 2) Cinder Cone Volcanoes 3) Composite Volcanoes 4) Lava Plateaus

  6. Types of Volcanoes: Composite, Cinder Cone, and Shield

  7. Shield Volcano

  8. Shield Volcanoes

  9. Shield Volcano

  10. Shield Volcano

  11. Shield Volcano

  12. Shield Volcanoes

  13. Characteristics of a Shield Volcano • A short, but wide, broad volcano (can be as much as 4 miles wide!) • Caused by thin layers of basaltic lava with low viscosity • Caused by quiet eruptions • has a caldera(large, cauldron-shaped crater) on top • Hawaiian Islands are made up of shield volcanoes (including Mt. Kilauea and Mouna Loa –2 of the most active volcanoes in the world!) • Very little pyroclastic material

  14. Cinder Cone Volcanoes

  15. Cinder Cone Volcanoes

  16. Cinder Cone Volcanoes

  17. Cinder Cone Volcanoes

  18. Cinder Cone Volcanoes

  19. Cinder Cone Volcanoes

  20. Cinder Cone

  21. Cinder Cone Volcanoes • A volcano with a steep slope and a large crater • Lava has a high viscosity • Ex. Paricutin in Mexico built up a cinder cone 400 meters high

  22. Composite Volcanoes

  23. Composite Volcanoes

  24. Composite Volcanoes

  25. Composite Volcanoes

  26. Composite Volcanoes • Tall volcanoes with small craters • Alternate between quiet eruptionsand explosive eruptions • Alternate between lavas that contain basalt and lavas that contain rhyolite • ex. Mount St. Helens in Washington State and Mount Fuji in Japan

  27. Composite Volcano

  28. Composite Volcano

  29. Lava Plateaus • Eruptions of lava that form flat, level areas • Thin, runny lava flows out of long cracks and then cools and solidifies • Ex. Columbia Plateau covers parts of the states of Washington, Oregon, and Idaho

  30. Lava Plateaus

  31. Lava Plateaus

  32. Lava Plateaus

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